Dado-plane.



H. SMILEY. l

DADO PLANE.

APPLIOATION FILED Nov. 30.1909.

Ptentea Feb; 21, 1911.-

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H. SMILEY.

DADO PLANE.

APPLICATION FILED NOV.-80, 1909.

Patented Feb. 21, 1911.

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UNITE STAES PATNT OFFfCE.

HENRY SMILEY, OF BOSTON, MASSACHUSETTS.

DADO-PLANE.

To all whom t 'may concern:

Be it known that I, HENRY SMILEY, a citizen of the United States, residing at the city of Boston, in the county of Suffolk and Commonwealth of Massachusetts, have invented certain new and useful Improvements in Dado-Planes, of which the following is a specification.

This invention relates to that class of groove cutting planes usually termed dado planes, and it has for its object the effecting of the improvements in details of construction hereinafter set forth.

Referring to the drawings forming part of this specification, Figure 1 is a side view of a plane made in accordance with my invention. Fig. 2 is a side view of the metallic part thereof, the wooden section forming part thereof being represented as removed. Fig. 3 is an edge View of the plane from beneath. Fig. 3a is an end View of the bladeengaging block. Fig. 3b is an end view of the blade-wedge. Fig. 4 is a transverse section on the dotted line X-X in Fig. 1; this and the following views being on a slightly larger scale than the preceding. Fig. 5 is a transverse section on the dotted line Y-Y in Fig'. 1. Fig. G is a longitudinal vertical section of a part of the plane showing the gage for permitting adjustment of the depth to which the plane can cut. Fig. 7 is a similar view but from the opposite side. Fig. 8 is a side elevation of a portion of the plane from a point opposite to that from which Fig. 1 is taken. Fig. 9 is a transverse sectional view of the plane through the center of the grooving cutters. Fig. 10 is a perspective View of said grooving cutters. Fig. 11 is a face view of the cutting blade of the plane. Fig. 19. is a face view of one of the U-shaped locking devices.

The plane comprises two main parts, one of metal containing the operating members, and the other of wood or the like inclosing said members at one side and having the handle 1. Said metallic portion consists of the thin plate 3 from which rise certain ribs and also the bosses 4 into which are tapped the screws 5 by means of which said wooden part G is secured to said metallic part.

The blade 7, shown in Figs. 2 and 11, rests against the rib-section 8 and also against the adjusting block 9, being made to share the longitudinal movement of the Specification of Letters Patent.

Application filed November 30, 1909.

Patented Feb. 21, 1911.

serial No. 530,706.

latter by means of one of its transverse grooves 10 into which projects the rib 11 of said block. This block is moved along the surface of the inclined rib 12 by means of the adjusting screw 13; the latter being turned by its head 14, and held `against longitudinal displacement by bearing 15 and the U-shaped locking device 16 located in a transverse slot in said bearing and engaging an annular groove 17 in the screw. Fig. 12 shows this locking device in face view, while Fig. 9 shows a duplicate of the same in section. JAbove the cutting edge of said blade 7 is a shaving-delector mouth 13, which, as shown in Figs. 1, 2 and 3, is so conformed as to perfectly eject all the shavings ploughed up by said blade. As indicated by Fig. 1, said mouth is substantially horse-shoe shaped vertically, while, as in Fig. 3 it is trumpet shaped laterally, thereby performing the function above set forth. Said blade is clamped in place by the vertically moved triangular block 19, the means for its movement being the thumb-screw 2O turning in the bearing 21 and held from longitudinal displacementby the U-shaped lock 16a, a duplicate of that illustrated by Fig. 12. As shown in Fig. Q, the nose of this clamping block 19 comes quite close to the cutting end of the blade 7, and the entire length, nearly, of said blade is so tightly pressed by said block as to firmly hold ity aga-inst all possibility of displacement or chattering. The vertical face or edge of this block abuts against the end of the rib 22 in order that there may be no lateral strain on the thumb screw 20, but have for its only function that of raising and lowering said block. To keep the cutting edge of said blade 7 flush with the metallic face of the -plane and still leave the plate 3 intact, said blade is oit-set somewhat, as shown in Fig. 11, and a part of said plate cut into as shown in Fig 8 to make room for t-he offset shoulder 23. To remove the blade for resharpening, the thumb screw 2O is turned to raise the block 19 a short distance, and then the screw 13 turned until the blade is carried far enough downward to bring its shoulder Q3 out from beneath the lip 24. The blade can now be moved laterally out of its engagement with the rib 11 of the block 9, and then longitudinally withdrawn fromthe plane. lts return is in the reverse manner.

It is customary to provide these dado planes with critters in advance of the blades for the purpose of scoring the lateral limits of the groove being plowed in the wood, in order that the shavings may be cut by the blade clear and clean from the wood, leaving the groove smooth and exact. There are `nrimeroris objections to those now in use,

which I have overcome by my construction. Previous to my invention, the critter points have been two in number, one at each side of the plane. a plurality of these cutter points at each side give mrich better results, and conseqriently I provide a vertically adjustable bar 25 with four such points Q6, two at a side, as shown in Figs. 2, 9 and 10. In the formation of these critter points, not only is the metal of the bar crit away both laterally and longitudinally with respect to the plane, in order to leave such points in operative relief, but I form channels 27 in the opposite sides of the bar in order to provide cutting lateral edges. These edges 28 are sharpened by a suitable file which can under-cut the same slightly. The critter points are lowered to take up for sharpening, and also rigidly held in place, by means of the adjusting screw 30 and the set screw 31 (Fig. 1), the former screw being held by its bearing 3Q and locking device 16b like the one 1G already described. As shown in Fig. 9, this bar has also to be off-set, for the same reason as the blade 7.

Normally the dado plane can cut to the depth permitted by the rinder surface of the wooden section 2. To permit accurately gaged grooves of lesser depth to be formed, I provide the adjustable stop 33 shown in Figs. 3, 6 and 7. This is crit into the wooden section 6, and is adjusted by means of the screw 34 turning in the boss and tapped into the boss 36 of the plate 37 which is fixed in place by suitable screws 3S. Said screw 3% being kept from displacement in its boss 35 by a locking device 1Gc such as already described, is adjusted either down to desired specified point, or carried up to its normal flush position, by suitably rotating said screw. Said fixed plate 37 is formed with a circular boss 39 (Figs. 4 and 7 for receiving the set screw 31 already described; said boss extending out [irish with the wooden section 6, and so providing said set screw with a metallic threaded member for its proper support. Thus made, this dado plane is strong, durable; its operative members are readily adjusted, crit clean and smooth, and in every way performs its work well and conveniently. It should be noticed that the critter points 26 are each substantially like those of a saw tooth, being angular and having cutting edges both iii front and behind. This enables them to cut and score the wood both when the plane is being advanced, and when it is being drawn I have forind, however, that backward, thus more perfectly preparing the way for the blade 7 to do its work. h/Ioreover, the cutting edges 28 above described act to smooth the sides of the groove being planed.

It will be observed that by having the angular block 11 formed with a vertical face coming down sharply to the ripper surface of the blade 7, there is no opportrinity given for the lodgnient of shavings against the saine; hence, taking this in connection with the peculiar conformation of the mouth 18, there can be no choking at the critting edge of said blade, and consequently no vexatioris loss of time in digging out srich accumulated chips.

As shown in Figs. 4, and 9, the U-shaped locking devices 16, 16a, 16h, 16C are held in place by the wooden section 6 fastened over the metallic section, and consequently all that requires to be done in order to take the various screws 13, Q0, 30 and 341 out, is to first remove said wooden section, then pry out said U-shaped devices and rinscrew said members. To keep the fastening screws 5 from digging into the Wooden section 6, I prefer to provide therefor the metallic thimbles 40, shown in Figs. 1 and 5, the outer edges of which are flush with the face of said section, and which receive the heads of said screws flush with the saine also.

It is essential that the surface of the mouth 18 opposite the blade 7 shall be made to initiate in the shaving a spiral form as it leaves the edge of said blade. To accomplish this, I form said srirface 18a with a twist in srich a manner that the rear edge of the mouth will retire behind the front edge at 18h, as shown in Figs. 1 and 9.. This twist extends upward from the blade edge for about five eighths of an inch; after that itbeing merged into the trumpet flare abovey described. Y

As shown in Fig. 3b, the block 9 is given a slightly oblique face on its side lying against the surface of the blade 7, inasmuch as the latter is laterally inclined in order to better crit the wood being grooved. In'the saine way, the wedge 19 mrist have its face lying against the blade similarly oblique, as shown in Fig. 3a.

That I claim as my invention and for which I desire Letters Patent is as follows, to wit;

1. The combination with a dado plane, of cutter points therefor comprising a metal bar having its end fashioned into four saw-V shaped points, each pair of points on thc faces of the bar parallel with the sides of the plane being separated a sribstantial distance one from the other by a vertical clearance channel extending up toward the ripper end of said bar, the sides of said channels presenting cutting edges.

2. A dado plane comprising two parts one of which is metal and is formed with tWo vertical parallel walls, a cutter point bar fitted to said Walls, the other of said two parts being of Wood and inelosing said bar, a metal plate fitted to the inner surface of said Wooden part and having a cylindrical boss passing through said Wooden part to its.

outer surface, and a set screw tapped through said boss and butting against said bar.

3. The combination in a dado plane, of a metallic section, a cutter-point member carried thereby, a screw for the adjustment of said member having an annular groove therein, a bearing for said screw formed with a transverse slot, a U-shaped locking device located in said slot and engaging said groove, and a section fastened to the metallic section and retaining said locking device in place.

In testimony that I Claim the foregoing invention, I have hereunto set my hand this 13 day of November, 1909.`

HENRY SMILEY.

IVitnesses:

A. B. UPHAM, I-I. L. WHITTLESEY. 

